Process of printing sulfur dyestuffs.



UNITED STATES:

Patented December 15,1903.

PATENT OFFIC EDMOND BOURCART, OF MiiLHAUsEN, GERMANY, AssIcNoR To THE FIRM GHIMIQUES DE THANN ET DE MUL- OF FABRIQUES DES PRODUITS HOUSE, OF THANN AND MULHAUSEN, A'LSACE, GERMANY.

i- ROCESS OF'PRINTING SULIFUR' QYESTUFFS.

SPECIFICATION forming part of Letters Patent No; 747,295, dated December 3- Applioation filed March 18,1902

To all whom it may concern:

Be it known that I, EDMoNDBoURoARr, doctor of philosophy, chemist, a citizen of the Swiss Republic,

5 Alsace, Germany, have invented a certain new and useful Process of Printing Sulfur Dyestuflz's, of which the following is a clear and complete specification.

The so-called sulfur dyestuffs,which are formed by the action of alkaline polysulfids on various organic matters, are generally brought on the market mixed with a rather considerable amount of alkaline sulfid. In

' this state they are not fit for printing, be-

!5 cause the sulfid has'a destructive action on the copper rollers..

If the free dyestuif is precipitated from its solution, it always retainsa large amount of free sulfur, and this free sulfur forms, again alkaline sulfid when the color is mixed with alkali. If thesulfur is entirely eliminated by several extractions with carbon disulfid, the coloring matter is no more able to be printed with caustic alkali alone. Addition of reducing organic bodies-forinstance, I glucose, glycerin, &c.--has not given satisfactory results.

The following successful one. The commercial coloring-matteris precipitated from its solution in alkaline sulfid by means of an acid,and the precipitate is washed until the acid reaction has disappeared. It contains then more or less of free sulfur.

This precipitate, as it'is or after spontaneous oxidation, mixed with a thickening, a certain amount of an alkaline carbonate, (neutral carbonate or bicarbonate,) and at least one reducing agent-as,

4o thiosulfate, sulfite, sulfur, glucose,

process is in every case a formiate or xanthate,

&c.is ready for printing and does no more attack the copper rollers.

The sulfur and the other reducing agents act only when the cloth is steamed. Therefore the printing-color is stable and may be kept for a certain time, whereas the color reduced before printing oxidizes itself rapidly in the presence of air, a fact which contributes to make disadvantageous the processes known residing at Miilhausen,

for instance, sodium Serial No. 9&799. (No specimens.)

hitherto. The alkaline carbonate or bicarbonate and the free sulfur yield on steaming alkaline sulfid, which serves to fix the coloring-matter, and in presence of aredlucing' agent this fixation is more rapid. The patterns printed in this way resist completely to-- washing and soaping without staining the white ground.

All the sulfur dyestuffs tried hithertoefcr instance, Bayers katigene, Cassellas immedial, the kryogen of the Badische Anilin und Soda Fabrik,the pyrogene or sulfogene of the Society of Chemical Industry, Leonhardts pyrol, &c.-may be printed in this way- As an illustration of my process the following directions may be given:

1. Ten parts pure immedial blue B extra in paste, fifty parts thickening, ten parts sodium bicarbonate, five parts sodium thiosulfate, twenty-five parts water.

II. Thirty parts of pyrogene black G in paste, fifty parts thickening, ten parts sodium bicarbonate, five parts glucose,

five parts water.

111. Thirty par y e 'brown in Paste sodium bicarboh: ate, five parts water.

five parts sodium' I V. Twenty-five parts katigene green 2B in paste form, fifty parts thickening, ten parts sodium bicarbonate, three parts zinc sulfid, (ZnS,) twelve parts water.-. VI. Twenty parts katigene indigo paste, ten parts sodium bicarbonate, five parts sodium xauthate, sixty-five parts thickening. Metallic carbonates or sulfide may-be added to these colors in order to change the shade and increase the solidity. If the colors are less thickened in order to keep them more fluid, they may be used forgpadding and produce plain pattern by steaming. The printing as well as the padding colors may be reserved by acid discharges or by soluble salts of-such metals as'form insoluble carbonates printed before steaming.

What I claim is- 1 The herein-described process of printing with a sulfur dyestuff which has been precipitated from its solution and which contains free sulfur but no alkaline sulfid, said process consisting in first mixing said precipitate with a thickening material, water, an alkaline carbonate and at least one reducing agent, at the ordinarytemperature, in order to produce a printing-paste containingthe sulfurdyestuff in a non-reduced state,

then printing and finally steaming the fabric after printing in order to form the alkaline sulfid necessary to fix the dyestuff.

2. The herein-described process of printing with a sulfur dyestuff which has been precipitated from its solution and which conan alkaline bicarbonate and at least 'one reducing agent at the ordinary temperature, in order to produce a printing-paste containiug the sulfur dyestufi in a non-reduced state, then printing and finally steaming the fabric af 3r printing in order to form the alkaline sulfid necessary to fix the dyestufi.

In witness whereof I have hereunto signed my name, this 6th day of March, 1902, in the presence of two subscribing witnesses.

EDMOND BOUR'CART.. Witnesses:

CHARLES MENNIER-DAUPF, A AND BITTER. 

